GoCopy was my first experience with a paid AI content generator. It was fairly intuitive to begin using, and the output is solid. I use the content expander and rewriter most often, so I can't comment on how well it does with long form content, but in my experience it is great for turning simple thoughts into polished content.

The reason I didn't give it five stars is because when I want to view options for rewriting without destroying my original content, having to switch between the main window and the sidebar is not the best experience. Also, I occasionally get results containing branded content, which makes me feel like it might be plagiarized from other sites.